1) I've not had any more crashes in the current version of Odyssey than I used to get in Horizons (both rare). There were some stability problems earlier but for me at least it's been fine for months.
2) As others have said, there's a (decent, skippable) tutorial for some of the basics of walking around at the start, and then there's a bunch of UI changes to get used to. In my opinion (and again, this wasn't true on release day) the Odyssey UIs are better than the Horizons UIs at most things but there are still some areas where the Horizons UI is faster, so it will depend a bit on exactly what you do, and of course it'll take a while to get used to even the bits which work better.
3) Odyssey, definitely. The extra landable planets and surface bases are worthwhile even if you don't get out of your ship, and exobiology adds a bit more purpose to visiting the surface of a planet. The on-foot bits specifically didn't really click for me - it was a nice diversion for a few months upgrading my suits, and I don't count "getting out of the SRV for ten seconds to scan a plant" - but even without those there's enough to make it worth using since you own it anyway.
If you hadn't already bought it, I'd have said "wait for a sale" since you're clearly not so enthusiastic about the concept of walking around as to make the choice obvious.
To be clear, having started Odyssey, you can freely switch between the Odyssey and Horizons clients as much as you like without affecting your progress or assets at all (with the necessary exception that if you log out of Odyssey in an Odyssey-only area, then log in to Horizons, you'll be teleported out of the restricted area). So if you really don't like it, go back to Horizons after and you're no worse off for having tried it.
To answer the specific comments you've heard:
Odyssey will be the one that gets bug fixes, Horizons 3.8 will be the one which gradually decays and gets no more fixes other than for critical bugs (which in practice means "won't start at all" / "weapons hurt your own ship not the target" levels of bug)
Odyssey doesn't have any more bugs than Horizons used to - yes, there's still a lot, and yes, they mostly won't be fixed, this is still Elite Dangerous, but if you can put up with the level of bugs in Horizons then you'll be fine with Odyssey.
Odyssey does have higher system requirements than Horizons. If you're at or above the recommended spec you should be able to get it to run playably at 1920x1080, at least. This one is very dependent on your personal hardware and your personal tolerance for lower resolutions/framerates than your hardware gets in "other games" so you'll just have to try it and see.
That's true. Others prefer the Odyssey one. I think it depends what you're wanting to do:
- look at from space (pretty similar, for me Horizons does better on small icy moons, Odyssey obviously better on thin-atmosphere worlds)
- go high-speed canyon racing (Horizons)
- go SRV driving or walking or low-speed low-altitude flying over terrain or just admire the view (Odyssey, especially at sunrise/sunset)
It is different (not totally!) and you'll need to spend a bit of time getting used to it. I certainly wouldn't want to go back to the Horizons maps or mission board interfaces, though, even for the few things they do better.